librustdoc::config: removed Input from Options

The `librustdoc::config::Options` struct no longer includes
`rustc_session::config::Input`. This is so that Input can be optional.
In rfc#3662, the crate input is not required if `--merge=finalize`.

Replacing Input with Option<Input> was decided against. In most places
that Input is needed, it should be statically known to not be optional
(means fewer unwraps). We just want to have an Input-free Options in
librustdoc::main_args, where we can run the write shared procedure.

src/librustdoc/config.rs

@@ -57,8 +57,6 @@ impl TryFrom<&str> for OutputFormat {
 #[derive(Clone)]
 pub(crate) struct Options {
     // Basic options / Options passed directly to rustc
-    /// The crate root or Markdown file to load.
-    pub(crate) input: Input,
     /// The name of the crate being documented.
     pub(crate) crate_name: Option<String>,
     /// Whether or not this is a bin crate
@@ -179,7 +177,6 @@ impl fmt::Debug for Options {
         }
 
         f.debug_struct("Options")
-            .field("input", &self.input.source_name())
             .field("crate_name", &self.crate_name)
             .field("bin_crate", &self.bin_crate)
             .field("proc_macro_crate", &self.proc_macro_crate)
@@ -348,7 +345,7 @@ impl Options {
         early_dcx: &mut EarlyDiagCtxt,
         matches: &getopts::Matches,
         args: Vec<String>,
-    ) -> Option<(Options, RenderOptions)> {
+    ) -> Option<(Input, Options, RenderOptions)> {
         // Check for unstable options.
         nightly_options::check_nightly_options(early_dcx, matches, &opts());
 
@@ -751,7 +748,6 @@ impl Options {
         let unstable_features =
             rustc_feature::UnstableFeatures::from_environment(crate_name.as_deref());
         let options = Options {
-            input,
             bin_crate,
             proc_macro_crate,
             error_format,
@@ -824,15 +820,13 @@ impl Options {
             html_no_source,
             output_to_stdout,
         };
-        Some((options, render_options))
+        Some((input, options, render_options))
     }
+}
 
-    /// Returns `true` if the file given as `self.input` is a Markdown file.
-    pub(crate) fn markdown_input(&self) -> Option<&Path> {
-        self.input
-            .opt_path()
-            .filter(|p| matches!(p.extension(), Some(e) if e == "md" || e == "markdown"))
-    }
+/// Returns `true` if the file given as `self.input` is a Markdown file.
+pub(crate) fn markdown_input(input: &Input) -> Option<&Path> {
+    input.opt_path().filter(|p| matches!(p.extension(), Some(e) if e == "md" || e == "markdown"))
 }
 
 fn parse_remap_path_prefix(

src/librustdoc/core.rs

@@ -20,7 +20,7 @@ use rustc_interface::interface;
 use rustc_lint::{late_lint_mod, MissingDoc};
 use rustc_middle::hir::nested_filter;
 use rustc_middle::ty::{ParamEnv, Ty, TyCtxt};
-use rustc_session::config::{self, CrateType, ErrorOutputType, ResolveDocLinks};
+use rustc_session::config::{self, CrateType, ErrorOutputType, Input, ResolveDocLinks};
 pub(crate) use rustc_session::config::{Options, UnstableOptions};
 use rustc_session::{lint, Session};
 use rustc_span::symbol::sym;
@@ -177,8 +177,8 @@ pub(crate) fn new_dcx(
 
 /// Parse, resolve, and typecheck the given crate.
 pub(crate) fn create_config(
+    input: Input,
     RustdocOptions {
-        input,
         crate_name,
         proc_macro_crate,
         error_format,

src/librustdoc/doctest.rs

@@ -19,7 +19,7 @@ use rustc_errors::{ColorConfig, DiagCtxtHandle, ErrorGuaranteed, FatalError};
 use rustc_hir::def_id::LOCAL_CRATE;
 use rustc_hir::CRATE_HIR_ID;
 use rustc_interface::interface;
-use rustc_session::config::{self, CrateType, ErrorOutputType};
+use rustc_session::config::{self, CrateType, ErrorOutputType, Input};
 use rustc_session::lint;
 use rustc_span::edition::Edition;
 use rustc_span::symbol::sym;
@@ -88,7 +88,11 @@ fn get_doctest_dir() -> io::Result<TempDir> {
     TempFileBuilder::new().prefix("rustdoctest").tempdir()
 }
 
-pub(crate) fn run(dcx: DiagCtxtHandle<'_>, options: RustdocOptions) -> Result<(), ErrorGuaranteed> {
+pub(crate) fn run(
+    dcx: DiagCtxtHandle<'_>,
+    input: Input,
+    options: RustdocOptions,
+) -> Result<(), ErrorGuaranteed> {
     let invalid_codeblock_attributes_name = crate::lint::INVALID_CODEBLOCK_ATTRIBUTES.name;
 
     // See core::create_config for what's going on here.
@@ -135,7 +139,7 @@ pub(crate) fn run(dcx: DiagCtxtHandle<'_>, options: RustdocOptions) -> Result<()
         opts: sessopts,
         crate_cfg: cfgs,
         crate_check_cfg: options.check_cfgs.clone(),
-        input: options.input.clone(),
+        input: input.clone(),
         output_file: None,
         output_dir: None,
         file_loader: None,

src/librustdoc/doctest/markdown.rs

@@ -3,6 +3,7 @@
 use std::fs::read_to_string;
 use std::sync::{Arc, Mutex};
 
+use rustc_session::config::Input;
 use rustc_span::FileName;
 use tempfile::tempdir;
 
@@ -69,9 +70,8 @@ impl DocTestVisitor for MdCollector {
 }
 
 /// Runs any tests/code examples in the markdown file `options.input`.
-pub(crate) fn test(options: Options) -> Result<(), String> {
-    use rustc_session::config::Input;
-    let input_str = match &options.input {
+pub(crate) fn test(input: &Input, options: Options) -> Result<(), String> {
+    let input_str = match input {
         Input::File(path) => {
             read_to_string(path).map_err(|err| format!("{}: {err}", path.display()))?
         }
@@ -79,7 +79,7 @@ pub(crate) fn test(options: Options) -> Result<(), String> {
     };
 
     // Obviously not a real crate name, but close enough for purposes of doctests.
-    let crate_name = options.input.filestem().to_string();
+    let crate_name = input.filestem().to_string();
     let temp_dir =
         tempdir().map_err(|error| format!("failed to create temporary directory: {error:?}"))?;
     let args_file = temp_dir.path().join("rustdoc-cfgs");
@@ -96,8 +96,7 @@ pub(crate) fn test(options: Options) -> Result<(), String> {
     let mut md_collector = MdCollector {
         tests: vec![],
         cur_path: vec![],
-        filename: options
-            .input
+        filename: input
             .opt_path()
             .map(ToOwned::to_owned)
             .map(FileName::from)

src/librustdoc/lib.rs

@@ -727,22 +727,24 @@ fn main_args(
 
     // Note that we discard any distinction between different non-zero exit
     // codes from `from_matches` here.
-    let (options, render_options) = match config::Options::from_matches(early_dcx, &matches, args) {
-        Some(opts) => opts,
-        None => return Ok(()),
-    };
+    let (input, options, render_options) =
+        match config::Options::from_matches(early_dcx, &matches, args) {
+            Some(opts) => opts,
+            None => return Ok(()),
+        };
 
     let dcx =
         core::new_dcx(options.error_format, None, options.diagnostic_width, &options.unstable_opts);
     let dcx = dcx.handle();
 
-    match (options.should_test, options.markdown_input()) {
-        (true, Some(_)) => return wrap_return(dcx, doctest::test_markdown(options)),
-        (true, None) => return doctest::run(dcx, options),
-        (false, Some(input)) => {
-            let input = input.to_owned();
+    match (options.should_test, config::markdown_input(&input)) {
+        (true, Some(_)) => return wrap_return(dcx, doctest::test_markdown(&input, options)),
+        (true, None) => return doctest::run(dcx, input, options),
+        (false, Some(md_input)) => {
+            let md_input = md_input.to_owned();
             let edition = options.edition;
-            let config = core::create_config(options, &render_options, using_internal_features);
+            let config =
+                core::create_config(input, options, &render_options, using_internal_features);
 
             // `markdown::render` can invoke `doctest::make_test`, which
             // requires session globals and a thread pool, so we use
@@ -750,7 +752,7 @@ fn main_args(
             return wrap_return(
                 dcx,
                 interface::run_compiler(config, |_compiler| {
-                    markdown::render(&input, render_options, edition)
+                    markdown::render(&md_input, render_options, edition)
                 }),
             );
         }
@@ -775,7 +777,7 @@ fn main_args(
     let scrape_examples_options = options.scrape_examples_options.clone();
     let bin_crate = options.bin_crate;
 
-    let config = core::create_config(options, &render_options, using_internal_features);
+    let config = core::create_config(input, options, &render_options, using_internal_features);
 
     interface::run_compiler(config, |compiler| {
         let sess = &compiler.sess;